The NGA-Subduction (“NGA-Sub”) project is one in a series of Next Generation Attenuation (NGA) projects directed towards database and ground-motion model development for applications in seismic-demand characterization. Whereas prior projects had targeted shallow crustal earthquakes in active tectonic regions (NGA-West1 and NGA-West2) and stable continental regions (NGA-East), NGA-Sub is the first to address specifically subduction zones. Subduction zone earthquakes are a dominant source of seismic hazard in many regions globally, including the Pacific Northwest region of the United States and Canada. The ground motion models are based on processed recordings and supporting source, path, and site metadata from Alaska, Cascadia, Central America and Mexico, Japan, New Zealand, South America, and Taiwan.

NGA-Sub was funded by FM Global, US Geological Survey, California Department of Transportation, and Pacific Gas & Electric Company, and was coordinated through the Pacific Earthquake Engineering Research Center. The development of this portal was funded by the NHR3, California Department of Transportation, and Pacific Gas & Electric Company.

The NGA-Sub project entails extensive technical interactions among 37 individuals from many different organizations around the world. Their efforts and dedications are gratefully acknowledged. Further information on the project is available and in Bozorgnia et al. (2021 – Earthquake Spectra).

Products on this Web Site

• Ground-Motion Records:

  • >>>> NGA-Subduction Web Portal on AWS: Ground-Motion Record Search and Download <<<<<<

• Maps:

  • NGA-Subduction Database Interactive Maps NEW!!!!

• Ground-Motion Models:

  • NGA-Subduction Ground-Motion Models in Excel/VisualBasic (2022 models) UPDATE!!!!

  • NGA-Subduction Ground-Motion Models in R, Matlab, & Python (2020 models)

• Datasets:

  • NGA-Subduction Relational DATABASE & FLATFILE

    • Direct Link to Flatfile Download

  • NGA-Subduction Component PSA IM Tables: H1 ,H2, V, RotD50, RotD100 5%-damping Dataset (Release: June 2023)

  • NGA-Subduction Comulative Absolute Velocity (CAV) Dataset (Release: June 2023)

  • NGA-Subduction Duration Metrics Dataset (Release: June 2023)

  • NGA-Subduction Volcanic-Arc Dataset (Release: July 2024)

• Publications

  • References to NGA-Sub Publications

Project Participants

• PI: Yousef Bozorgnia: Professor, Civil and Environmental Engineering, UCLA

• Norman A. Abrahamson: University of California, Berkeley, CA

• Sean K. Ahdi: U.S. Geological Survey, Geological Hazards Science Center, Golden, CO

• Timothy D. Ancheta: Risk Management Solutions, Portland, OR

• Linda Al Atik: Linda Al Atik Consulting, San Francisco, CA

• Ralph J. Archuleta: University of California, Santa Barbara, CA

• Gail M. Atkinson: Western University, Ontario, Canada (retired)

• Dave M. Boore: United States Geological Survey, Moffett Field, CA (retired)

• Yousef Bozorgnia: University of California, Los Angeles, UCLA, CA 90095

• Kenneth W. Campbell: Kenneth W Campbell Consulting, Beaverton, OR

• Brian S.-J. Chiou: California Department of Transportation, Sacramento, CA

• Victor Contreras: University of California, Los Angeles, UCLA, CA

• Robert B. Darragh: Pacific Engineering and Analysis, El Cerrito, CA

• Sahar Derakhshan: University of South Carolina, Columbia, SC

• Jennifer L. Donahue: J.L. Donahue Consulting, Bend, OR

• Nick Gregor: Nick Gregor Consulting, Oakland CA

• Zeynep Gulerce: Middle East Technical University, Ankara, Turkey

• I.M. Idriss: University of California, Davis, CA (retired)

• Chen Ji: University of California, Santa Barbara, CA

• Ronnie Kamai: Ben Gurion University, Israel

• Tadahiro Kishida: Khalifa University of Science and Technology, Abu Dhabi, UAE

• Albert R. Kottke: Pacific Gas & Electric Company, San Francisco, CA

• Nicolas M. Kuehn: University of California, Los Angeles, UCLA, CA

• Dong Youp Kwak: Hanyang University, Ansan, South Korea,

• Annie O.-L. Kwok: National Taiwan University, Taipei, Taiwan

• Po-Shen Lin: Sinotech Engineering Consultants, Inc.

• Harold Magistrale: FM Global, Boston, MA Norwood, MA

• Silvia Mazzoni: University of California, Los Angeles, UCLA, CA

• Suburoh Midorikawa: Tokyo Institute of Technology, Tokyo, Japan (retired)

• Sifat Muin: University of California, Berkeley, CA

• Grace A. Parker: United States Geological Survey, Moffett Field, CA

• Sanaz Rezaeian: U.S. Geological Survey, Golden, CO

• Hongjun Si: Seismological Research Institute Inc. Tokyo, Japan

• Walt J. Silva: Pacific Engineering and Analysis, El Cerrito, CA

• Jonathan P. Stewart: University of California, Los Angeles, UCLA, CA

• Melanie Walling: GeoEngineers, Redmond, WA

• Katie Wooddell: Slate Geotechnical Consultants, Berkeley, CA

• Robert R. Youngs: Wood., Oakland, CA